Steam-engine.



E. G. DOOLITTLE.

STEAM ENGINE., A PPLIOATION FILED APB. 11, 1.902.

PATENTBD APR. 21,1903. v

110.725,945. l PATLNTBD APR. 21, 1903.

' E. c. DOOLITTLB.

STEAM BNG-INE.

. APPLICATION FILED umn, 1902. no MODEL. f Y I 2 SHEETS-sunny z.

' "u E 'a /lf y L M5 Avv. /x/

UNiTnD STATns PATENT OFFICE.

ELBRIDGE `C. DOOLITTLE, OF WALLINGFORD, CONNECTICUT, ASSIGNOR OF ONE-HALF TO VI'LLIAM HASSETT, OF VVALLINGFORD, CONNECTICUT.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No.7725,945, dated April 21, 1903.

Appnmiot tied Apr1111,19o2.

To LZZ whom' it may concern:

Beit known that LELBRIDGE C.DooL1TTLn, of Wallingford, in the county of New Haven and State of Connecticut, have invented a. new and useful I mprovement in Steam-En-I gines; and I do hereby declare the following, when taken in connection with the accompa-4 nying drawings and the gures of reference marked thereon, to be a full, clear, and exact description of the saine, and which said drawings constitute part of this specification, and represent, in-

Figure 1, a side view of a double engine constructed inaccordance with my invention;

Fig. 2, a top or plan view of the same; Fig.n 3, a vertical central section thereof.

This invention relates-to an improvement in steam-engines, and-while particularly applicable for motor-vehicles and other purposes in which a compact construction is essential is equally applicable for larger engines for any desired purpose, the object of the invention being to construct an engine in which the connection between the piston and the crank-shaft shall be as direct as possible, so as to prevent loss of power, one so simple in construction that it can be built at very llow cost, and one not liable to derangement; and the invention consists in the construction as hereinafter described, and particularly recited in the claims.

As herein shown, I have illustrated a dou- 'ble or two-cylinder engine; but the two cylinders are counterparts of each other, and the description of one will be the description of both, and, if desired, but one cylinder may be employed. The cylinders 2 are closed at opposite ends by caps 3 4, and on one side of the cylinder is a steam-chest 5, having a passage 6 extending into the top of the cylinder and a passage 7 extending into the bottom of the cylinder, the steam-chest and cylinder being formed integral with each other. Opening into the steam-chest is an inlet-pipe 8, and in one side of the steam-chest is an exhaustopening 9, leading to any desired point. The steam-chests are formed with a flange 10, by which they may be coupled together or which may be closed by a plate when only one cylinder be employed. In the cylinder is a piston having a central portion 11 and heads 12,

la crank 18 on a crank-,shaft 19.

'nenn No; 102,350. (No model.)

and in the side of the cylinder opposite the steam-chest is a slot 13, the length of which is slightly greater than the throw of the piston. On opposite sides of this slot are guideways 14 for a slide 15, the length of the slide being such that when the piston is at its extreme positions the slide will close the slot 13. Ex-

tending through the slide and into the central portion 1l 0f the piston is a pin 16, to 6o which a pitlnan 17 is connected, the pitman extending downward into engagement with Within the steam-chest is the usual cut-off 20, adapted to alternately open and-close'the ports 21 and 65 22, which lead to the passages 6 and 7, and

this slide is operated by a stem`23, which extends downward into'engagement with an eccentric 24, mounted on the crank-shaft 19, so

vthat the rotation of that shaft will operate 7o the cutolf. This crank-shaft 19 extends through a gear-box 25,Which may be connected with flanges 26, projecting from the bottom of the cylinders, or secured to the frame or casing upon which the cylinders are mounted.

The operation is as follows: Steam being admitted to the steam-chest will pass through one of the ports therein into one end of the cylinder and drive the piston to the opposite end. This movement of the piston moving 8o the pin 16 projecting from it moves the pitman 17, and hence turns the crank 18 and the crank-shaft 19, the rotation of which turns the eccentric 24 and moves the cut-olf slide 23, and hence the slide 20, so as to close one 0f the ports and open the other, allowing the steam to pass to the opposite end'of the cylinder to move the piston in the opposite direction. When two cylinders are employed, it will be understood that the cut-offs for the 9o second cylinder are arranged to operate reversely ou the quarter from those of the first cylinder, as do also the cranks to prevent dead-center.

It will thus be seen that an extremely simple engine is produced and that no piston-rod proper is employed, the pitman taking the place 0f one, and the connection between the piston and the crank-shaft is so direct that there is practically no loss of power, the moveroo ment of the piston positively causing the crank-shaft to be turned.

The reversing mechanism herein shown and described is not claimed in this application, as it will form the subject of a separate'application.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a steamengine, the combination with the cylinder thereof, of a steam-chest formed integral therewith and upon one side thereof, and having passages from it to opposite ends of the cylinder, a slot in one side of said cylinder, longitudinal guideways arranged upon the outer face of the cylinder on opposite sides of the slot, a slide longitudinally movable between said ways and adapted to cover said slot, a piston in said cylinder, a pin connected with said piston and extending outward through said slot and slide, and direct connection between the pin and the crankshaft, substantially as described.

Versely-arranged crank-shaft, eccentrics on said shafts, cut-off slides in said steam-chests, and connection between the cut-01T and said eccentrics, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

ELBRIDGE C. DOOLI'ITLE.

Witnesses:

J. I-I. SHUMWAY, FREDERIC C. EARLE. 

